New safety assessment methods for off-site transportation of spent nuclear fuel

New safety assessment methods for off-site transportation of spent nuclear fuel
The RICPP methodology framework for spent fuel road transportation. Credit: GE Daochuan

The safety of off-site transportation of spent nuclear reactor fuel is the foundation of ensuring the back-end circulation of nuclear fuel and the sustainable development of nuclear energy. Performing risk assessment on the transportation of spent fuel can identify potential weaknesses in the system in a timely manner, so that preventive and mitigation measures can be effectively taken to reduce transportation risks.

How to comprehensively identify, characterize and quantify the multiple heterogeneous dynamic risk factors of the complex transportation system, and thus quantitatively assess transportation risks, is the main challenge of current spent transportation studies.

A research team led by associate Prof. Ge Daochuan from the Hefei Institutes of Physical Science (HFIPS) of the Chinese Academy of Sciences has proposed a series of systematic risk assessment and route optimization methods, which can effectively reduce the radioactive risk, time cost and economic cost of the road and maritime transportation of spent fuel.

The researchers proposed a radioactive risk-informed integrated path planning (RICPP) method for spent fuel road transportation under multi-objective and weight-constrained route optimization indexes, considering radioactive risk cost, time cost and , which facilitates the selection of a safer and more economical route.

Due to the lack of comprehensive characterization and of internal and external risk factors such as , ship failure, and navigation environment in the risk assessment of spent fuel maritime transportation, they suggested an integrated probabilistic risk assessment (IPRA) method integrating deterministic and probabilistic modeling perspectives, including comprehensive risk indicators and radionuclide diffusion hydrodynamic models.

  • New safety assessment methods for off-site transportation of spent nuclear fuel
    The IPRA methodology framework for spent fuel maritime transportation. Credit: GE Daochuan
  • New safety assessment methods for off-site transportation of spent nuclear fuel
    Dynamic simulation of nearshore flow field (top) and radionuclide concentration (bottom) distribution at different times under the leakage accident scenario. Credit: GE Daochuan

On this basis, the dynamic concentration of radionuclide in coastal seawater was finely simulated and the radiological risk to the public was quantified.

This study could help build a road-sea-rail multimodal transportation support system for spent fuel from .

In addition, it provides theoretical guidance for the safety design optimization and operation risk management of small modular nuclear reactor, mobile nuclear power supply, small mobile space reactor and other radioactive material transportation systems.

The research was published in Reliability Engineering & System Safety.

More information: Longlong Tao et al, An integrated probabilistic risk assessment methodology for maritime transportation of spent nuclear fuel based on event tree and hydrodynamic model, Reliability Engineering & System Safety (2022). DOI: 10.1016/j.ress.2022.108726
Citation: New safety assessment methods for off-site transportation of spent nuclear fuel (2022, September 9) retrieved 2 December 2022 from https://techxplore.com/news/2022-09-safety-methods-off-site-spent-nuclear.html
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